ASSRA Forum - keyholing 7mm Rolling Block

ASSRA Forum › General › Single Shot Rifles › keyholing 7mm Rolling Block

(Moderator Group: Moderator)

‹ Previous Topic | Next Topic ›

Pages: 1

keyholing 7mm Rolling Block (Read 123 times)

George Babits Frequent Elocutionist Offline Posts: 1146 Joined: Sep 27^th, 2012	keyholing 7mm Rolling Block Yesterday at 3:54pm	Print Post
	I've got a really nice 7mm rolling block. It shoots fine with 175 grain jacketed bullets at 2350 fps. But, my preferred load is a 168 gas checked bullet which runs about1820 fps. The problem is that the cast bullet keyholes 2 shots out of 5. The same load shoots fine in my 7mm rolling block carbine so I don't think it is the ammunition. Any ideas? George


	IP Logged

jimmy Senior Forum Member Offline Now available in Oklahoma. Posts: 464 Location: Skiatook Joined: May 12^th, 2009	Re: keyholing 7mm Rolling Block Reply #1 - yesterday at 4:21pm	Print Post
	Check groove diameter and bullet size.


	IP Logged

GunBum Senior Forum Member Offline Posts: 292 Location: SW Missouri Joined: Oct 30^th, 2021	Re: keyholing 7mm Rolling Block Reply #2 - yesterday at 4:35pm	Print Post
	What is the twist rate? I’ve had several 7x57 rifles that shot 175gr bullets fine and keyholed with lighter bullets.


	IP Logged

George Babits Frequent Elocutionist Offline Posts: 1146 Joined: Sep 27^th, 2012	Re: keyholing 7mm Rolling Block Reply #3 - yesterday at 5:26pm	Print Post
	The cast bullet is 168 g +/- and the jacketed bullet is standard 7mm spitzer. The cast bullets are sized to 284 and work fine in my 7 mm rolling block carbine. I haven't a clue what the twist is, but I'd guess 1 in 10 as that is standard for the 7mm and both rifle and carbine are "standard." With the cast bullets I usually get a nice 1.5 inch group for 3 shots (sitting) at 80 to 100 yards with two keyholes. I suppose I should see where the keyholes fit in the order of rounds fired? George


	IP Logged

GunBum Senior Forum Member Offline Posts: 292 Location: SW Missouri Joined: Oct 30^th, 2021	Re: keyholing 7mm Rolling Block Reply #4 - yesterday at 8:01pm	Print Post
	I have several 7x57 95 Mausers (yeah I know, not a single shot) that will do 1-1/2” at 100 yards with 175 grain bullets, and anything under 170 grains keyholes. It is 1:220mm (about 1:8.7in). Once the bullet gets too short, it isn’t stable anymore.


	IP Logged

Pages: 1

‹ Previous Topic | Next Topic ›

Page completed in 1.4666 seconds.