Crowning Questions?

DMK · September 3, 2002, 01:05 PM

What are the advantages of an 11 degree crown over a 45 degree or vice versa?

Also, should crowning a barrel change the POI?

I recrowned my SKS and it shot a few inches to the right first time out. It's no problem as it does group tighter, I'm just curious as to why I needed to adjust the sight.

C.R.Sam · September 3, 2002, 02:59 PM

Absolutely square to the bore probably the most important factor.

Your point of impact shift may be due to correction of an old crown problem.....or a new one.

Sam

Lefty · September 3, 2002, 08:06 PM

... it could have changed the barrel harmonics which, IMHO, would more likely cause a shift in POI. Then again, if you didn't rest or bench it in the same manner, that too could have caused the shift.

kurt IA. · September 4, 2002, 08:57 AM

Both the above are right, I cut a barrel 1/4 inch at a time and re crowned, from 27" down to 22" and had a 1.5 to 2 inch inpact change each time, in this case it was a 22RF barrel and I was trying to tune it for best group.

DMK · September 4, 2002, 09:39 AM

Thanks guys. I guess what I experienced is within the range of normal. It's amazing what you can learn by trying new stuff.

Anybody have any opinions on the different crown angles?

kurt IA. · September 6, 2002, 09:21 AM

I have not found that one stile has any advantage over the other, cut the one you like, or is easy for you. I like a resested flat crown.

September 3, 2002, 01:05 PM	#1
DMK Senior Member Join Date: November 18, 2001 Location: Over the hills and far, far away Posts: 2,295	Crowning Questions? What are the advantages of an 11 degree crown over a 45 degree or vice versa? Also, should crowning a barrel change the POI? I recrowned my SKS and it shot a few inches to the right first time out. It's no problem as it does group tighter, I'm just curious as to why I needed to adjust the sight. __________________ DMK - Homeland Security begins at home: Support your Second Amendment. - Remember to support friends who support us: http://www.gunowners.org/ - http://www.nra.org/ http://www.jpfo.org/ - http://keepandbeararms.com/ http://www.2asisters.org/ http://www.grnc.org/ - http://www.ncrpa.org/

September 4, 2002, 09:39 AM	#5
DMK Senior Member Join Date: November 18, 2001 Location: Over the hills and far, far away Posts: 2,295	Thanks guys. I guess what I experienced is within the range of normal. It's amazing what you can learn by trying new stuff. Anybody have any opinions on the different crown angles? __________________ DMK - Homeland Security begins at home: Support your Second Amendment. - Remember to support friends who support us: http://www.gunowners.org/ - http://www.nra.org/ http://www.jpfo.org/ - http://keepandbeararms.com/ http://www.2asisters.org/ http://www.grnc.org/ - http://www.ncrpa.org/

September 3, 2002, 02:59 PM	#2
C.R.Sam Senior Member Join Date: October 30, 1999 Location: Dewey, AZ Posts: 12,864	Absolutely square to the bore probably the most important factor. Your point of impact shift may be due to correction of an old crown problem.....or a new one. Sam

September 3, 2002, 08:06 PM	#3
Lefty Senior Member Join Date: April 26, 2000 Location: Mass - the cradle of liberty!! Posts: 106	... it could have changed the barrel harmonics which, IMHO, would more likely cause a shift in POI. Then again, if you didn't rest or bench it in the same manner, that too could have caused the shift.

September 4, 2002, 08:57 AM	#4
kurt IA. Senior Member Join Date: February 19, 2001 Location: Iowa Posts: 141	Both the above are right, I cut a barrel 1/4 inch at a time and re crowned, from 27" down to 22" and had a 1.5 to 2 inch inpact change each time, in this case it was a 22RF barrel and I was trying to tune it for best group.

September 6, 2002, 09:21 AM	#6
kurt IA. Senior Member Join Date: February 19, 2001 Location: Iowa Posts: 141	I have not found that one stile has any advantage over the other, cut the one you like, or is easy for you. I like a resested flat crown.