Trimmed cases all to the same length is said to be helpful for tighter groups but seating carefully to the same OAL will not benefit at all. Cartridge base to ogive is the more precise measurement that yields consistent bullet entry into the lands. Over all length will not be consistent due to bullet length variation.If I trim all my cartridges to precisely the same length and seat my bullets so that the carefully measured final OAL is the same, will that make a significant difference in how the loads group~??
This isn’t that kind of forum though, is it?OAL is important to consider for loading out of a magazine….CBTO is not telling you much for those more than a reference thereafter when seating bullet for those.
And depending of the type of guns..OAL mean everything for proper function.
If I trim all my cartridges to precisely the same length and seat my bullets so that the carefully measured final OAL is the same, will that make a significant difference in how the loads group~??
H was asking about tighter groups here. Hence my comment.OAL is important to consider for loading out of a magazine….CBTO is not telling you much for those more than a reference thereafter when seating bullet for those.
And depending of the type of guns..OAL mean everything for proper function.
Well, sounds like I should measure length from cartridge base to ogive as OAL.Trimmed cases all to the same length is said to be helpful for tighter groups but seating carefully to the same OAL will not benefit at all. Cartridge base to ogive is the more precise measurement that yields consistent bullet entry into the lands. Over all length will not be consistent due to bullet length variation.
Absolutely will be the most accurate measurement for group improvement.Well, sounds like I should measure length from cartridge base to ogive as OAL.
H was asking about tighter groups here. Hence my comment.
Rifle is single shot built on XP100 actionOAL is important to consider for loading out of a magazine….CBTO is not telling you much for those more than a reference thereafter when seating bullet for those.
And depending of the type of guns..OAL mean everything for proper function.
Thank you. I should have thought of thst~!Absolutely will be the most accurate measurement for group improvement.
Very welcome Sir.Thank you. I should have thought of thst~!
WOW new topic !!! I never though about that . Just checked 24 rounds that I have loaded and found 3 that were .011 different , so I marked them and will shoot them in the same group . I have a barrel stub gauge that I checked with in 6 BR . Why would some be different ??? The three that are different are once fired and the other seven are new brass .Trimmed cases all to the same length is said to be helpful for tighter groups but seating carefully to the same OAL will not benefit at all. Cartridge base to ogive is the more precise measurement that yields consistent bullet entry into the lands. Over all length will not be consistent due to bullet length variation.
What caliber is your XP100 ? I have two XP100 rifles .If I trim all my cartridges to precisely the same length and seat my bullets so that the carefully measured final OAL is the same, will that make a significant difference in how the loads group~??
WOW new topic !!! I never though about that . Just checked 24 rounds that I have loaded and found 3 that were .011 different , so I marked them and will shoot them in the same group . I have a barrel stud gauge that I checked with in 6 BR . Why would some be different ??? The three that are different are once fired and the other seven are new brass .
Yes Sir, Sam covers that in the video where he finds the same thing you are describing and he contributes that to the case growing from base to shoulder once it is fired.Bill Norris . , I understand all that . When I'm saying OAL that is measured head to the Ogive , I'm not measuring to the tip of the bullet . When I measured with the barrel stub that was made with my reamer on a piece of 243 barrel so the bullets are touching the rifling . What I see is Loaded once fired round measured different than new brass loaded same set up .