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Chasing speed - am I being greedy?

 
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Old 11-06-2012, 10:25 AM
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Chasing speed - am I being greedy?

So finally got some spare time with work slowing down (got a new job I start after turkey day) plus the rains put a dampener on my shop project, and with the addition of my new Lyman DPS 1200 Ive been reloading and developing some loads for a couple rifles. Lately have been concentrating on my Tikka T3 Lite 7 mag. Tried a couple different powders, but have had best results with H1000, I have been using my Berger 168 VLD's with a standard primer, and just cheapo Winchester brass.

Anyways, most accurate load I have had has been 68.5 grains of H1000... See pic...





Anyways, been doing ladder loads. Started down at 66 grains, most accurate was 68.5, when I hit 69-70 it start getting pretty wide (1"), and the most powder I have put through it so far is 71.0 grains of powder. Dont have any pressure signs yet, and the groups are starting to shrink back down (71.0 was at .632"). So should I keep going hotter to see if the groups get better, or leave it at 68.5 grains? Looks like most guys on soe other boards that are running the same bullets and powder are right around the 72 grain range getting between 2900-3000 FPS...

Out of a 24" barrel how much velocity is an extra 5 grains of powder going to give me?
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Old 11-06-2012, 10:30 AM
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Re: Chasing speed - am I being greedy?

What range are you testing at? Try a CCI BR2 Primer with both of the loads you had good results with.
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Old 11-06-2012, 10:33 AM
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Re: Chasing speed - am I being greedy?

100, gonna go out to 200yrds next trip out.

Debating if I should try more powder...
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Old 11-06-2012, 10:41 AM
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Re: Chasing speed - am I being greedy?

Quote:
Originally Posted by novaman64 View Post
100, gonna go out to 200yrds next trip out.

Debating if I should try more powder...
Well it has been my experience that there can be a very large difference in a group that looks amazing at 100 yards and what it does at 200 yards, just keep that in mind. As long as you don't have pressure signs it sounds safe and you should explore your options if your not happy. The CCIBR2 seams to be a load tamer, making H1000 more consistent.
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Old 11-06-2012, 03:00 PM
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Re: Chasing speed - am I being greedy?

am i wrong of shouldnt you use mag primers in the 7mm mag ??????
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Old 11-06-2012, 03:15 PM
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Re: Chasing speed - am I being greedy?

Quote:
Originally Posted by submoa View Post
am i wrong of shouldnt you use mag primers in the 7mm mag ??????
Depends on several things. I use non mag primers in my 300 RUM with RL 25, but this is with a 30+ inch barrel. I would probably stick with mag primers. You also need to hook up with a chronograph. Only then can you tell what velocity your round is producing along with checking for pressure signs as you approach max.
db
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Old 11-06-2012, 03:35 PM
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Re: Chasing speed - am I being greedy?

I use 68.5 grains of H100 in my 7mm, CCI250 primers and it's going 2932fps this is group I shot Sat. 800yds. measured just over 2.75" with the cold bore shot at the right, 5 shots. The only thing I should have done is checked pressure didn't have meter with me so used standard pressure actual pressure would have put them up where they should have been. I could get more speed but why make it harder on barrel. Barrel is 28".
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