-
Having trouble using the site?
Contact support
22 creedmoor
- Thread starter Subhunter2
- Start date
4 groove, tight bores were the configuration that people theorized being hard on bullets in fast twists so your probably good. My unsupported theory is that a Shilen button rifled ratchet profiled 7.5 twist would be on the other end of that spectrum.
Had some black friday deals so I went with a 1/7.5tw benchmark button rifled 6 grooves med palma for my 18in jack of all trade rifle on a ARC CDG with a xylo chassis for the 75-88gr weight range and I also got a carbon wrapped 1/7 18in for my defiance anti ultra lightweight hnt26 for the 77 lrx for dedicated varmint and white tail gun.
Going to use N555 exclusively with Alpha SRP brass.
Probably won't do much of load dev since the barrel life is short on these, I'll target for 3200 for the LRX, 80.5 and 3100 for the 88s which should be able 39-41gr of N550 at 2.65 according to VV, Hornady and QL
Going to use N555 exclusively with Alpha SRP brass.
Probably won't do much of load dev since the barrel life is short on these, I'll target for 3200 for the LRX, 80.5 and 3100 for the 88s which should be able 39-41gr of N550 at 2.65 according to VV, Hornady and QL
I shoot N555 in alpha srp brass, 18in 7.5tw 4gr 237 bore ace barrel. You're desired speed will likely require more powder. My barrel was cut with alpha 169fb chamber. I'm jumping 88s bout 50k at 2.71 oal, and with a drop tube, 43.5gr was all I could fit, 3150mv. Shoots well there but a bit toasty, dropped to 42.1gr and running 3040mv, all weather safe load. Just my experience with your exact desired load combo. Good luck!
Hornady match 6 creed bushing die with a .250 TiN bushing and an undersized button on the de-capper Then it gets ran over a mandrel.
I recently screwed on a varmint contour 24" Shilen 7.5 twist ratchet rifled barrel. I will report back on how it works with the Hornady bullets... I am planning to primarily shoot the 80 ELDx which I am hoping will also avoid blow up issues due to its thicker jacket. The initial loads will be with H4350 and Alpha brass.
Figured I would report back on initial loads. All loads shot out of a 24" Shilen Select Match with 1/7.5 twist on a Rem 700 action.
Used the 80 ELD-X and 64 Nosler Bonded. All were Alpha LRP brass with CCI-200's.
Both H1000 and N565 are a little on the slow side with 80's. Topped out around 3150 with 45 gr of each (they were equivalent), and this was a compressed load. No concern for pressure.
With H4350 and the 80's, I topped out at 38 gr and 3050 fps. I think H4350 is a bit too fast for maximum velocity.
The Nosler 64's got up to 3550 with 42.5 gr of H4350. Didn't try any slower powders.
Plan for next session is to try some N555, N560, and Superformance.
Used the 80 ELD-X and 64 Nosler Bonded. All were Alpha LRP brass with CCI-200's.
Both H1000 and N565 are a little on the slow side with 80's. Topped out around 3150 with 45 gr of each (they were equivalent), and this was a compressed load. No concern for pressure.
With H4350 and the 80's, I topped out at 38 gr and 3050 fps. I think H4350 is a bit too fast for maximum velocity.
The Nosler 64's got up to 3550 with 42.5 gr of H4350. Didn't try any slower powders.
Plan for next session is to try some N555, N560, and Superformance.
N555 works very well. I'm running 42.2gr with 88eldm at 3030 from an 18" barrel. 40.0 gr H4350 shot well with same bullet at same speed range. Both these loads are about a grain away from pressure in this rifle. Alpha srp brass, cci450 primers. 219 bore 4gr ace barrel.
