trying to develop a load for a tactical match. using 162 amax on 63.5 gr of Re-22. Fed 215 primers. According to sierra manual this should yield 2900 - 2950 fps. Out of my 24" rem factory barrel I just got 2525 on a CED chrono. Is that even possible?
7mm rem mag velocities
- Thread starter Barrel Nut
- Start date
Re: 7mm rem mag velocities
Have you looked through this thread? http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=349882#Post349882
Your results sound pretty low. Is that an average of how many shots? Was your chrono too close or in direct sunlight?
Have you looked through this thread? http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=349882#Post349882
Your results sound pretty low. Is that an average of how many shots? Was your chrono too close or in direct sunlight?
Re: 7mm rem mag velocities
That was an average of about 7 shots...In direct sunlight with skyscreens on. and about 15 feet from muzzle Thanks for the link It looks like I can go up in powder charge some I did not have any pressure signx...
That was an average of about 7 shots...In direct sunlight with skyscreens on. and about 15 feet from muzzle Thanks for the link It looks like I can go up in powder charge some I did not have any pressure signx...
Re: 7mm rem mag velocities
Not really sure where to go next.. most all load data says that I can safely go up 1.5 to 2 gr. But that would likely add just another 100 fps. 2650 out of a Rem may seems pretty weak. According to my loading manuals I should be 2900 - 3000 already. Whiskey Tango?
Not really sure where to go next.. most all load data says that I can safely go up 1.5 to 2 gr. But that would likely add just another 100 fps. 2650 out of a Rem may seems pretty weak. According to my loading manuals I should be 2900 - 3000 already. Whiskey Tango?
Re: 7mm rem mag velocities
You need to have your chrono in a shaded area. I've gotten lots of funny readings in direct sunlight.
You need to have your chrono in a shaded area. I've gotten lots of funny readings in direct sunlight.
Re: 7mm rem mag velocities
I guess it could be the chrono but the numbers were pretty consistent. E.S. of about 22 fps for 7 rounds, so not like it was all over the place. The load didn't shoot very well so I'll likely go up in powder anyway but I need an accurate MV to determine trajectories.
I guess it could be the chrono but the numbers were pretty consistent. E.S. of about 22 fps for 7 rounds, so not like it was all over the place. The load didn't shoot very well so I'll likely go up in powder anyway but I need an accurate MV to determine trajectories.
Re: 7mm rem mag velocities
With your Data your going 400fps to 500fps slower than listed.
Check out this Thread to get a comparison,
http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=349882
With your Data your going 400fps to 500fps slower than listed.
Check out this Thread to get a comparison,
http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=349882
Re: 7mm rem mag velocities
I looked through the load data thread. There were a couple of guys going up to 66.5 gr with the amaxs and RE-22. That is about 2 gr over the Max load listed in the sierra manual. I don't believe even that would get me to 3000 fps. I thought surely I could get that with the Amax.
I looked through the load data thread. There were a couple of guys going up to 66.5 gr with the amaxs and RE-22. That is about 2 gr over the Max load listed in the sierra manual. I don't believe even that would get me to 3000 fps. I thought surely I could get that with the Amax.
Re: 7mm rem mag velocities
Double check your charge weights and your chrono. If possible shoot it over another chrono and double check by shooting some 22lr ammo across the screens first.
Double check your charge weights and your chrono. If possible shoot it over another chrono and double check by shooting some 22lr ammo across the screens first.
Re: 7mm rem mag velocities
In the link there are others who are getting 2900-3000fps with 168-180gr bullets using the same powder and similar charge.
Why would yours be that much slower.......Just Sayin
In the link there are others who are getting 2900-3000fps with 168-180gr bullets using the same powder and similar charge.
Why would yours be that much slower.......Just Sayin
Re: 7mm rem mag velocities
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: CWCruiser</div><div class="ubbcode-body">In the link there are others who are getting 2900-3000fps with 168-180gr bullets using the same powder and similar charge.
Why would yours be that much slower.......Just Sayin
</div></div>
That's kinda my point. I checked my scale with Check weights. The. 22lr idea is a good one but I am just wondering if anyone has any experience with a load being that much slower than expected and what might cause it.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: CWCruiser</div><div class="ubbcode-body">In the link there are others who are getting 2900-3000fps with 168-180gr bullets using the same powder and similar charge.
Why would yours be that much slower.......Just Sayin
</div></div>
That's kinda my point. I checked my scale with Check weights. The. 22lr idea is a good one but I am just wondering if anyone has any experience with a load being that much slower than expected and what might cause it.
Re: 7mm rem mag velocities
I have officially figured this one out. I added more powder to the loads and went back the next day and shot through the chrony again. I was getting even slower velocities. 64 gr RE-22 in a 7mm Rem mag now reading 2250 fps on the chrony. Consistant but obviously very low. I then moved over to another bench and lowered the chronograph till both sensors were completely in the shade and shot 25 rounds all with very consistent velocities in the 2950 range. It seems that the sunlight was at a bad angle and giving very erroneous chronograph readings.
I have officially figured this one out. I added more powder to the loads and went back the next day and shot through the chrony again. I was getting even slower velocities. 64 gr RE-22 in a 7mm Rem mag now reading 2250 fps on the chrony. Consistant but obviously very low. I then moved over to another bench and lowered the chronograph till both sensors were completely in the shade and shot 25 rounds all with very consistent velocities in the 2950 range. It seems that the sunlight was at a bad angle and giving very erroneous chronograph readings.
Re: 7mm rem mag velocities
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mscott</div><div class="ubbcode-body">You need to have your chrono in a shaded area. I've gotten lots of funny readings in direct sunlight. </div></div>
I should have given you credit here......You were dead on, and your suggestion was why I moved it to the shade.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mscott</div><div class="ubbcode-body">You need to have your chrono in a shaded area. I've gotten lots of funny readings in direct sunlight. </div></div>
I should have given you credit here......You were dead on, and your suggestion was why I moved it to the shade.
Re: 7mm rem mag velocities
There's a reason I knew the problem .... I've obviously been there. Glad you got it figured out before adding too much powder.
There's a reason I knew the problem .... I've obviously been there. Glad you got it figured out before adding too much powder.
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