.300 Win Mag (Navy SEAL version)

#2
Re: .300 Win Mag (Navy SEAL version)

Welcome to the Hide. Come on in and join the many and varied conversations.

If you know something about a given thread post your experience. If not, you're welcome to sit back and absorb what you wish.

Most of us older folk really appreciate it if you fill out your profile if you haven’t already.

Once again, nice to have you here.
 
#4
Re: .300 Win Mag (Navy SEAL version)

I don't have a direct answer to your question and I really never had a reason to ask the people who do know.

I will say that unless you have a particular reason to need THAT load (other than to say it's a SEAL load) then I would just do a workup and select the load that is most accurate in YOUR rifle. If the SEALs use an arsenal load or an off the shelf load, then a custom load for YOUR rifle will more than likely be more accurate.
 
#6
Re: .300 Win Mag (Navy SEAL version)

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BushDog Tactical</div><div class="ubbcode-body">Would anybody out there know the load data for the Navy SEALs .300 Win Mag ammo?

I would like to see how it would perform in my rifle.

Thanks for you input and help,

BushDog Tactical </div></div>
I have the data you are asking for at home, I have a box. It uses WCC brass, you can get once fired from GI BRASS web site, 190gr Sierra's, the powder is, I think Reloader 19, if you PM me, I will send the fine details to you later today. But I agree with the earlier statement, if you want the best load for your rifle, work one up, this ammo is good, but it may not be what your rifle likes the best.
 
#7
Re: .300 Win Mag (Navy SEAL version)

I have a slight problem, I have some Black Hills Standard ammo which is loaded to 3.340 OAL and then I have some that is loaded to the "SEAL standard" and the OAL is much greater.

My problem with the SEAL stuff is I have two different OALs one is 3.480" and the other is 3.445" I have no idea which OAL is the correct one. Both will chamber just fine but I am concerned that one will not shoot as well as the other, I am hoping the shorter OAL will be the correct one and I can just bump the rounds back. Anyone with correct info please advise.
 
#10
Re: .300 Win Mag (Navy SEAL version)

The maximum OAL for both the Mark 248 Mod 0, often referred to as the A191 cartridge loaded with the 190 SMK, and the Mark 248 Mod 1, the new cartridge with the 220 SMK, is 3.50 inches.

The reference noted above for the A191 cartridge states that length is above the SAAMI spec for .300 WM cartridges. That length is 3.340 inches.

The specification for the Mod 1 may provide you with some useful information.

https://www.neco.navy.mil/upload/N00164/N0016409RJN30000209RJN30_0002_att.pdf

In doing some muzzle velocity testing on the A191, I noted that it's pretty temperature sensitive. The muzzle velocity exhibits a rate of change substantially greater than 2 fps per degree F.

The specifications for the Mod 1 call for a rate of change of muzzle velocity with temperature of not more than 0.405 fps per degree F. It will be interesting to see if the ammunition meets that spec.

In short, trying to reproduce the A191 for use in rifles with SAAMI spec chambers may not be a good idea.
 
#13
Re: .300 Win Mag (Navy SEAL version)

Thanks Lindy that is what I was looking for the min and max OAL the other document stated the max but I didn't see a min. The ammo is factory that I got second hand because the bullets were being jammed in the lands and pulling the bullets if he had to unload. So I just wanted to check to see what the correct specs were suppose to be so I could adjust and make the two different lots uniform. Good info incase anyone else runs across the problem, I'll be going with the shorter length of 3.450"
 
#14
Re: .300 Win Mag (Navy SEAL version)

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: hogstooth</div><div class="ubbcode-body">Yeah I would rather not waste $1.50 a shot and just get the correct info, I had considered doing that, but don't wana waste the range trip either. </div></div>

I always felt that if I got good data from it, the range trip isn't a waste. If you aren't going to shoot them, how do you know where to aim?
 
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