Which 6.5 Creedmoor Brass and Bullets?

[farmerboy78]

Gtscotty, my mistake.... 2,850 fps without the supressor and 2,900 fps with it. Two 5-shot groups shown below during load development. The Hornady primer pockets are on the loose side after the first factory firing.

I agree the small primer case will take a bit more pressure, but you are running 6.5-06 velocity out of a case smaller than the creedmoor. It shoots really well but you are way over pressured. That load may bite you one day...

 

[MCMXI]

you are running 6.5-06 velocity out of a case smaller than the creedmoor. It shoots really well but you are way over pressured. That load may bite you one day...

43.4gr of Reloder 17 with the brass and COAL that I'm using is safe according QuickLOAD. The data below is for non suppressed.

 

[Gtscotty]

43.4gr is the max load for 120 gr speers in Alliant's data. I think I'd put more stock in Alliant's pressure tested loads than a quick load simulation... Especially if you are getting loose primer pockets in a few loadings, I don't see how there would be any question that you are way over pressure.

 

[MCMXI]

Especially if you are getting loose primer pockets in a few loadings, I don't see how there would be any question that you are way over pressure.

Thanks for your concern but "loose" is a general term without any point of reference. Primers seat just fine, don't fall out, don't allow gas to blow by the primer to erode the bolt face etc., so I don't think this is big deal, but I would prefer more positive primer seating feedback. I was an ammunition R&D engineer at Remington for two years (November '11 to November '13) and used QuickLOAD regularly and became confident in the accuracy of the program with numerous powders, bullets, cases and primers since I could validate the data using test barrels with transducers and high end chronographs. Load manuals are generic so I really don't care what they publish as min and max for a given powder.

 

[Gtscotty]

Thanks for your concern but "loose" is a general term without any point of reference. Primers seat just fine, don't fall out, don't allow gas to blow by the primer to erode the bolt face etc., so I don't think this is big deal, but I would prefer more positive primer seating feedback. I was an ammunition R&D engineer at Remington for two years (November '11 to November '13) and used QuickLOAD regularly and became confident in the accuracy of the program with numerous powders, bullets, cases and primers since I could validate the data using test barrels with transducers and high end chronographs. Load manuals are generic so I really don't care what they publish as min and max for a given powder.

Neat, out of curiosity, what does quick load predict for H4350?

 

[MCMXI]

what does quick load predict for H4350?

I think I posted this before but here are the QuickLOAD predictions for H4350. Maybe others here can confirm the validity of the data based on charge weight & velocity. This data is for a 24" barrel and the powder hasn't been calibrated.

 

[Gtscotty]

I think I posted this before but here are the QuickLOAD predictions for H4350. Maybe others here can confirm the validity of the data based on charge weight & velocity. This data is for a 24" barrel and the powder hasn't been calibrated.

I looked back at my magnetospeed data for my load ( 42.5gr H4350, Hornady case, CCI 200, 140gr Nosler CC), my average over 24 rds @ 63 deg was 2,725 fps.... Pretty darn close to predicted, albeit with a different bullet.