I’m buying a scope for a new field 338 LM. I asked several questions in 3 previous posts that eliminated the options that don’t fit this application, so I’m down to 5 wonderful options – hence the post title "splitting hairs"
. This forum is awesome! I have a few more specific questions then I can place the order.
The application is LR mountain hunting in Alaska and Montana to 1,000 yards max and ELR iron targets out to 1,700+ yards. Extra carry-around weight needs to be justified by meaningful improvements in field results. The rifle plus scope base and rings weigh about 8 lbs 2 oz. The modified weight goal (after forum member feedback nixed the lighter scope option due to insufficient optics) is between 10 lbs 1 oz (31 ounce scope) and 10 lbs 8 oz (38 oz scope).
All of these scopes have been discussed a ton except the March 5-40x56mm. However, there is very little discussion of the differences in field performance for rough use LR hunting and ELR target, so some of the answers we are getting are different than the majority of the posts you see. This is why IMHO this post is not re-hashing old ground. See the PS information at the bottom for links to the app specific information we have picked up so far prior to this post.
Here are the remaining scope options listed in increasing build weight:
March 5-40x56mm (31.3oz scope, 10 lbs 1 oz complete build)
S&B PM II 3-20 (32.4 oz scope, 10 lbs 2 oz complete build)
Vortex Razor HD 5-20x50mm (35 oz scope, 10 lbs 5 oz complete build)
Premier Heritage 5-25x56mm (38 oz scope, 10 lbs 8oz complete build)
S&B PM II 5-25x56mm (38 oz, 10 lbs 8 oz complete build)
I like all of these FFP reticles, with a preference for the March FX FML due to the .05 Mil floating dot surrounded by 0.5 mil clear box that lets you see around the dot to the target at 1,000+.
It’s now down to these questions:
(1) Is there any concern with any of these scopes in a rough field ELR 338 LM application?
(2) If you have used any of these scopes for LR and ELR, which scope do you recommend and why? I would especially appreciate LR/ELR feedback on the March 5-40 because there is not much out there yet.
(3) All these scopes are reported to have really solid mechanicals with great tracking and repeatability and dialing for distance seems easy to master with practice. Would you agree with this for all these scopes? Have you had any poor experience with any of the turrets in field conditions?
(4) Is the optics quality difference between scopes, or the turret/mechanical ease of use difference among these scopes enough to justify the weight increase of 7 oz from lightest to heaviest?
If you can spare the time to reply, thanks in advance! I will post some pics of the finished rifle with scope after I digest the feedback, make the buy and mount it. I’ll also post the first target grouping pics for the XCR II 338 LM in the bolt rifle forum.
PS – in the three previous posts we learned some useful things to know about scopes for this application:
In posts:
Field Test: Razor v SS v DMR G2 v NXS
Questions: SWFA SS HD 5-20x50 for Long Range
JROB300 did an excellent longer term comparative review concluding that the SS 5-20x50m has unbelievable optics for the price (this is reported everywhere), however extended use under competition stress shows that the turrets are not in the same league as the high end scopes listed above for high precision ELR and/or rough field work applications (turret slop +/- 1 click is also reported in other posts).
In post:
Does Razor 5-20 Stand Up To Top LR Optics?
JROB300 also cited competition experience that shows the Razor is a rock solid proven ELR performer out to 2,000+ yards that competes right in there with S&B and the other top scopes in field stress conditions.
In post:
Question on March F 3-24x42mm For 338 Lapua XCR II
SSSamauri made it clear that the March 3-24x42mm is a fantastic scope for medium range work with magnification up to about 18x (and it weighs much less than 50/56mm scopes), but the 42mm objective simply doesn’t gather enough light at LR/ELR to compare optically with the scopes still on the final list above. Also from the same post thread, .17Sniper and tolnep reported very favorable mid-range results with the March 5-40, excellent reticle, but slightly degraded optical performance and eyebox fussiness above 30X (still beats 20/25X though).
PSS- if you haven’t read them, forum member ILya did some great work in the following reviews:
High End Tactical Scopes: Part II
High End Tactical Scopes: Part III
And fireguyty did a great review of the March 3-24 that he used for tac comp:
Review: March-F 3-24 x 42 FFP

The application is LR mountain hunting in Alaska and Montana to 1,000 yards max and ELR iron targets out to 1,700+ yards. Extra carry-around weight needs to be justified by meaningful improvements in field results. The rifle plus scope base and rings weigh about 8 lbs 2 oz. The modified weight goal (after forum member feedback nixed the lighter scope option due to insufficient optics) is between 10 lbs 1 oz (31 ounce scope) and 10 lbs 8 oz (38 oz scope).
All of these scopes have been discussed a ton except the March 5-40x56mm. However, there is very little discussion of the differences in field performance for rough use LR hunting and ELR target, so some of the answers we are getting are different than the majority of the posts you see. This is why IMHO this post is not re-hashing old ground. See the PS information at the bottom for links to the app specific information we have picked up so far prior to this post.
Here are the remaining scope options listed in increasing build weight:
March 5-40x56mm (31.3oz scope, 10 lbs 1 oz complete build)
S&B PM II 3-20 (32.4 oz scope, 10 lbs 2 oz complete build)
Vortex Razor HD 5-20x50mm (35 oz scope, 10 lbs 5 oz complete build)
Premier Heritage 5-25x56mm (38 oz scope, 10 lbs 8oz complete build)
S&B PM II 5-25x56mm (38 oz, 10 lbs 8 oz complete build)
I like all of these FFP reticles, with a preference for the March FX FML due to the .05 Mil floating dot surrounded by 0.5 mil clear box that lets you see around the dot to the target at 1,000+.
It’s now down to these questions:
(1) Is there any concern with any of these scopes in a rough field ELR 338 LM application?
(2) If you have used any of these scopes for LR and ELR, which scope do you recommend and why? I would especially appreciate LR/ELR feedback on the March 5-40 because there is not much out there yet.
(3) All these scopes are reported to have really solid mechanicals with great tracking and repeatability and dialing for distance seems easy to master with practice. Would you agree with this for all these scopes? Have you had any poor experience with any of the turrets in field conditions?
(4) Is the optics quality difference between scopes, or the turret/mechanical ease of use difference among these scopes enough to justify the weight increase of 7 oz from lightest to heaviest?
If you can spare the time to reply, thanks in advance! I will post some pics of the finished rifle with scope after I digest the feedback, make the buy and mount it. I’ll also post the first target grouping pics for the XCR II 338 LM in the bolt rifle forum.
PS – in the three previous posts we learned some useful things to know about scopes for this application:
In posts:
Field Test: Razor v SS v DMR G2 v NXS
Questions: SWFA SS HD 5-20x50 for Long Range
JROB300 did an excellent longer term comparative review concluding that the SS 5-20x50m has unbelievable optics for the price (this is reported everywhere), however extended use under competition stress shows that the turrets are not in the same league as the high end scopes listed above for high precision ELR and/or rough field work applications (turret slop +/- 1 click is also reported in other posts).
In post:
Does Razor 5-20 Stand Up To Top LR Optics?
JROB300 also cited competition experience that shows the Razor is a rock solid proven ELR performer out to 2,000+ yards that competes right in there with S&B and the other top scopes in field stress conditions.
In post:
Question on March F 3-24x42mm For 338 Lapua XCR II
SSSamauri made it clear that the March 3-24x42mm is a fantastic scope for medium range work with magnification up to about 18x (and it weighs much less than 50/56mm scopes), but the 42mm objective simply doesn’t gather enough light at LR/ELR to compare optically with the scopes still on the final list above. Also from the same post thread, .17Sniper and tolnep reported very favorable mid-range results with the March 5-40, excellent reticle, but slightly degraded optical performance and eyebox fussiness above 30X (still beats 20/25X though).
PSS- if you haven’t read them, forum member ILya did some great work in the following reviews:
High End Tactical Scopes: Part II
High End Tactical Scopes: Part III
And fireguyty did a great review of the March 3-24 that he used for tac comp:
Review: March-F 3-24 x 42 FFP