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Savage MLll grouping?Hi

 
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  #1  
Old 02-09-2010, 11:06 AM
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Join Date: Feb 2010
Location: Ohio
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Savage MLll grouping?Hi

Hi everbody, I'm new to this site and have a question? I am currently shooting my Savage with a 1:24 twist barrel 235gr QT spitzer (PRbullet in Manitoba) with the magnum sub base with 40gr of IMR 4759. 150yds I'm getting consistent 1" groups, but when I go to 200yds the grouping opens up to almost 12". Any suggestions. I've tried the 180grn and the 250grn Deadcenter with the same results. I've switched powder to Accurate 5744 with diff. grainage and the same result.
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Old 02-09-2010, 09:05 PM
ATH ATH is offline
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Re: Savage MLll grouping?Hi

One possibility is that those soft lead bullets don't hold tight in the barrel well and you are getting inconsistent ignition leading to varying velocities. This will show up as vertical stringing as the range increases. Only way to tell for sure is get it over a chrono. Is the group vertical or round?

Overall the PR bullets are felt to be suboptimal choices over smokeless as they don't handle the faster pressure curve of smokeless well and deform. Additionally, shooting .40 bullets in a .50 with smokeless is widely agreed not to work very well.

The 1" groups at 100yds make it curious, but in at least two ways (bullet diameter, material choice) you have the odds stacked against you.
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Old 02-09-2010, 09:59 PM
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Re: Savage MLll grouping?Hi

IMO, switch to a 0.452 SST or XTP in a MMP or Harvester sabot or even the 0.458 300 grain Barnes Original in a crush rib sabot.

Do you have any other powders?

edge.
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Old 02-11-2010, 10:46 AM
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Re: Savage MLll grouping?Hi

Hi Edge, I've used the following Bullets 1) TC shockwave 250grn w/ different charges of 5744 powder and IMR 4759 in grains anywhere from 39 to 42 slowly increasing in 1/2 grain increments also used the Hornady SST 250. Biggest problem with both Bullets was getting the damn things down the barrel. Called the sabot place in Alabama? MMP? and tried the 24HP? which made loading alot easier. Grouping wasn't any better at 100yds. The recommendation in the Savage book doesn't work at all, Id sure like to know how they came up with it. Anyhow this all brings me to PRbullett. I started with 180grns/ 40grns 4759( tried both powders in 1/2grn increments and ended up with 40) 1" groups at 150yds which was way better than anything else. Go to 200yds and the pattern was bigger than 12" not vertical but round. Thinking that bullet was getting eratic I tried the 220grn deadcenter not much of a change, went to the 235grn and things got a little tighter around 12" in a round pattern. Thinking of a heavier bullet or like you said should I move to a .45cal bullet. Thanks alot for the reply!!!
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Old 02-11-2010, 11:01 AM
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Re: Savage MLll grouping?Hi

I think that Harvester makes a crush rib sabot that might make loading easier....

IMO, try to shoot a 0.452 300 grain XTP.

If the XTP won't hold its group I don't know what will!
Quite honestly I don't know what would cause a Pistol bullet to go from 1 inch @ 100 to 12 inches @ 200 unless the velocity were low enough to go transonic...but it should not be at that range!

As far as too tight fitting sabots you might want the give the barrel a real good scrubbing. You may have plastic buildup.

edge.
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Old 02-11-2010, 11:53 AM
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Re: Savage MLll grouping?Hi

Barrel is clean no plastic, Wondering why you refer to the 235 QT as a Pistol Bullet? I thought the 235 QT polymer was a Spitzer. When talking to the Precision Rifle Bullet representative he called it a Spitzer.
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Old 02-11-2010, 12:05 PM
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Re: Savage MLll grouping?Hi

Quote:
Originally Posted by whopperstopper View Post
Barrel is clean no plastic, Wondering why you refer to the 235 QT as a Pistol Bullet? I thought the 235 QT polymer was a Spitzer. When talking to the Precision Rifle Bullet representative he called it a Spitzer.
Sorry, I was mainly referring to the SST / Shockwave bullets that experienced the same problems! IMO, it is much easier to see a long bullet doing this, but a short pistol bullet needs very little twist.

edge.
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