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7.62x54r H4895 Charge Weight Question

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Re: 7.62x54r H4895 Charge Weight Question

Postby gandog56 » Wed Mar 11, 2015 10:55 am

jaysny87 wrote:
this one was just over 1/2" center to center.
42.5gr charge H4895
Image


Yeah, but what grain bullets were you shooting?
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Re: 7.62x54r H4895 Charge Weight Question

Postby jaysny87 » Wed Mar 11, 2015 1:04 pm

gandog56 wrote:Yeah, but what grain bullets were you shooting?


This was with 174 grain Sierras.
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Re: 7.62x54r H4895 Charge Weight Question

Postby Grimstod » Wed Mar 11, 2015 5:15 pm

Great shooting. Now experiment with seating depth. I bet you can get that even tighter. I still see a little horizontal stringing. That will be fixable with seating depth changes.

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Re: 7.62x54r H4895 Charge Weight Question

Postby jaysny87 » Thu Mar 12, 2015 10:13 am

Yes I still need to play with my seating depth. I don't know about anybody else's but with this particular rifle I'm .01" off the lands with a C.O.L. of 2.940".
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Re: 7.62x54r H4895 Charge Weight Question

Postby farmerboy78 » Thu Mar 12, 2015 7:05 pm

The sierra smk is very forgiving, you don't have to have it loaded out that far, push it in a bit and I bet she drives tacks.
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Re: 7.62x54r H4895 Charge Weight Question

Postby Grindl » Mon Apr 20, 2015 1:44 pm

Farmer ; Could you explain why Jayz rifle would get more accurate by shortening the OAL / COL , since he is only .010 off now ? Most of the LR Shooters I've talked to want their bullet about .010 or less out of the lead...What am I missing here ?
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Re: 7.62x54r H4895 Charge Weight Question

Postby farmerboy78 » Mon Apr 20, 2015 5:48 pm

He may not have enough neck tension on the bullet to help ensure a good consistent powder burn...letting it be other than center when it enters the rifling...I load all my loads at a magazine friendly length with the smk and they shoot great...
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Re: 7.62x54r H4895 Charge Weight Question

Postby OLd_Sarg » Tue Apr 21, 2015 8:57 am

farmerboy78 wrote:He may not have enough neck tension on the bullet to help ensure a good consistent powder burn...letting it be other than center when it enters the rifling...I load all my loads at a magazine friendly length with the smk and they shoot great...


^^^ yep very true that is ^^^ :thumbup:
and if your loads have good neck tension you get a more robust cartridge that can take some knocks from the pocket to riding in the magazine all day to the recoil of other rounds without bending the case a bit or moving the bullet.
Also H4895 and for that matter IMR4895 are great picks for this "size class" of case as well as 308, 30-06 and so on, IMR4895 is my go to powder and a 168 SMK for my M1A match tuned rifle and never fails to shoot great.
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Re: 7.62x54r H4895 Charge Weight Question

Postby Grindl » Wed Apr 22, 2015 12:46 pm

Appreciate the additional info regarding the shorter OAL and "neck tension" . Since I fall into that group that "crimps", and uses detachable mags , I was trying to grasp the relevance . :thumbup:
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Re: 7.62x54r H4895 Charge Weight Question

Postby Grimstod » Wed Apr 22, 2015 1:03 pm

Loading for plinking and detachable mags is a totally doferent ball game from shooting for precision. You wont see a crimped bullet at the line one any bench shooting event. But they will dominate at your full auto or tachtocal events.

As for experimenting move only .003 at a time and shoot three shot groups. Once you find one that looks good load some five shot groups with .002 below and above and at then test again. Shoot for a good agrigate not a once in a while winner.
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