Switch Barrel Question

K

Keith Skjerdal

Member
When you switch barrels, how do you set the scope so the POI agrees with the crosshairs, without firing a round, can it be done?

I went out last weekend and tested with my 308 barrel on, then switched to my 6mm barrel. I bore sighted it to make sure it would hit paper at 100 yds and fired and corrected, about 1.5 moa up and maybe 1/2 moa right of where the 308 was printing. I did have to R&R the scope too since my rear action wrench would hit the rear of the scope when breaking the barrel free if I did not remove it. I know, too many things changing all at once to really tell anything. I should check to see how much it moves just removing and re-installing the scope too, but that's this weekend :) I don't think it will move much if any myself.

I ask this question since I may switch on the line next year during a match and I shoot at LR and I have figured it out if I switch barrels at these yardages (600 -308 to 800 with the 6), the net change is only add a 1.5 moa up and .5 moa left to my 308's scope dope at 600 yds and I should be on at 800 with the 6, and that's including last weekend's re-zero adjustment from barrel to barrel and the R&R of the scope.... but I have fairly big ones :rolleyes: I have R&R'd a scope in the middle of a BR score match between relays and there was only one other relay, but that was SR stuff. See why I'm asking. I'm figuring someone has "bin der don dat"

Keith
 
Keith,
Wow man! I can switch a barrel and scope at 100-200 and bore site my way to hit paper. I never tried it at 600, at a match ! The outcome can't be real competitive ! I guess if cross firing wasn't an issue and it was a dry dusty day you could see your bullet strike and click to it, but at a match !You're not gonna make any friends with fellow competitors or target crew/match director.
Joel
 
Changing a scope and changing a barrel are very different things I agree with Joel , getting on paper at 100 can usually be accomplished but thats about as far as is likely to work in my experience.

Dick
 
Dick and Joel, I've gotten myself lost at 800 yds once, windage wise, pulled the bolt and boresighted her and added the wind I saw, the next round was on target.
 
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Ok........ Keither, there IS someone else as crazy as you man ....... :rolleyes:

I've got a rifle built on a Time Precision action which fits carefully into a large double-sided guncase with 2 scopes, 7 barrels, two stocks, wrenches including a barrel vise and a borescope.

And a notebook :)

Using this notebook and about 20minutes of time (only to refresh my scattered recall) I can screw in ANY BARREL and EITHER SCOPE and dial to get on within an inch @100.

I also switch barrels on two other guns using a borescope. I've actually taken the 6BR barrel off of a Borden gun, put on the .243AI barrel, dialed it in on the borescope and hit squirrels at 200yds.

IMO, Good notes and a GOOD gun and you can change out within 1MOA which is better than factory guns SHOOT for cryin' in a bucket!


Notice that when I say "boresighter" I'm referring to a collimator. Bore sighting through the bore WILL NOT get you back in...now before someone jumps in my cereal bowl, it's not that I don't like true "Bore Sighting" it's just that IN THIS CIRCUMSTANCE a good collimator is more repeatable, by a level of magnitude.

I believe in sighting thru the bore for that "gettin' on paper" phase becaus it's MORE accurate than collimation but I've also got rifles which when they're shooting a bull at 300 you can't see the target paper through the bore.

Straight barrels suck anyway.....


:D


al

al
 
If the barrel is properly aligned during chambering, and you have an action with scope rail built in, you should be able to slip the scope off the rail, change barrels, slide the scope back on the rail, then shoot at 100. You should be within +/- 2" of where the last setup was zeroed at 100. (but oinly if the just removed barrel was chambered by the same method)

Now then, using range rods, letting the barrel muzzle flop wherever, then trying to index that floppy muzzle and such, who knows where the first shot will hit???

At 600? Zero at 100, click up 12.5 MOA and it should hit the paper at 600 on any caliber/load that you would normally use to compete at 600.
 
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