The 6UM

[Tx_6UM]

She’s a shooter. Fire form loads with 108eldm’s and 60gr of 570 averaged 2768 with an sd of 28.9. 2 shots to get dialed in, then an 8 round group. Hoping 3200-3300 is gonna be doable, but FF loads are definitely slower than I expected. Was able to stay on target at 100 zoomed to 14x. Ace/unknown did an excellent job on this prefit.

Also, officially changing my name to Tx_6um.

 

[The Fish Box]

What’s your barrel length?

 

[Tx_6UM]

What’s your barrel length?

18”

 

[khuber84]

18”

You're using 60gr powder, max is 67-68(fire formed). Of course you're going to be slow. Some your pressure is lost blowing the shoulder forward.

 

[Tx_6UM]

You're using 60gr powder, max is 67-68(fire formed). Of course you're going to be slow. Some your pressure is lost blowing the shoulder forward.

That’s fair. This is my first time fire forming brass and thought I’d be closer to 3k than I am.

 

[Andrew31]

Does anyone have QuickDESIGN and can build this for those of us with QuickLOAD?
Using a 6.5 RSAUM spec'd to .243 doesn't work. khuber84s 68 gr recommendation would run a Pmax of 69,570. Some of the other loads people are reporting 3,250fps+ are mid 70-80k Pmax and estimating under 2900fps.

 

[Stocky]

Does anyone have QuickDESIGN and can build this for those of us with QuickLOAD?
Using a 6.5 RSAUM spec'd to .243 doesn't work. khuber84s 68 gr recommendation would run a Pmax of 69,570. Some of the other loads people are reporting 3,250fps+ are mid 70-80k Pmax and estimating under 2900fps.

You can do it in GRT.