Son Of A Gun
Bryce I have never seen a bunch of shots hit lower on the paper as you describe with a rifle.I have heard of this being true with a pistol.
In a pistol a slower shot takes longer to exit the barrel so you end up getting more vertical out of it.Atleast that is the story I heard.
The closest thing I have to a shortrange gun is a 6BR with a 21-3/4 barrel 1.450 straight cylinder.It climbs as the powder charge climbs.
In Vaughn's book the roll-off he is talking about is very small I thought.
Typicaly when I do a "Audette" 'Ladder" or whatever anyone calls it I take it out to 300 or 400 yards.At 100 yards you get a big hole after 10 to 15 shots and it ruins your test.At 400 yards your shots seperate for 4 or 5 shots then they do what looks like a slow shift to the right.As you go up in charge weight the very next shot that goes vertical moves back into alignment with the other vertical shots.So picture this 5 shots going up in a straight line then 4 shots going to the right for about 1 inch.The very next shot goes right back into alignment with the first 5 just higher.
That 6th shot moved the most of any shot.
Now as we keep going up it repeats but when they start shifting slightly to the right the number of shots in it are fewer in number.The plateau is narrower.
Now as we continue to go up the spacing between the shots gets larger as we pressure out.
In that example we never had one shot hit significantly lower.If we had gone up in smaller increments like 0.1 grain instead of 0.4 gr at a time is when you get that one weird hit sometimes 2.
If this were a typical 1000 yard heavygun like a 300 Ackley that plateau would be 2.5 grains wide while the second plateau may only be 2 grains wide.It is in the plateau that you see a very small amount of roll-off.This is what I see when I read Vaughn's thoughts in his book.
Our heavyguns will weigh 75 pounds or more and have a 2 inch barrel on them 32 inches long.The stock is solid aluminum and will weigh 40 pounds empty.The barrel block is integral to the stock so there is no chance of it coming loose.The 8-9 inches of barrel inside of the block are bedded in J-B Weld for a perfect fit.The rest system is as close to a machine rest as the rules will allow and I put 75 pounds of lead shot on it as well.It is a pretty stout set-up.
When I see a shot rolling off we are talking about less than a quarter inch at 400 yards.
Lynn
Bryce I have never seen a bunch of shots hit lower on the paper as you describe with a rifle.I have heard of this being true with a pistol.
In a pistol a slower shot takes longer to exit the barrel so you end up getting more vertical out of it.Atleast that is the story I heard.
The closest thing I have to a shortrange gun is a 6BR with a 21-3/4 barrel 1.450 straight cylinder.It climbs as the powder charge climbs.
In Vaughn's book the roll-off he is talking about is very small I thought.
Typicaly when I do a "Audette" 'Ladder" or whatever anyone calls it I take it out to 300 or 400 yards.At 100 yards you get a big hole after 10 to 15 shots and it ruins your test.At 400 yards your shots seperate for 4 or 5 shots then they do what looks like a slow shift to the right.As you go up in charge weight the very next shot that goes vertical moves back into alignment with the other vertical shots.So picture this 5 shots going up in a straight line then 4 shots going to the right for about 1 inch.The very next shot goes right back into alignment with the first 5 just higher.
That 6th shot moved the most of any shot.
Now as we keep going up it repeats but when they start shifting slightly to the right the number of shots in it are fewer in number.The plateau is narrower.
Now as we continue to go up the spacing between the shots gets larger as we pressure out.
In that example we never had one shot hit significantly lower.If we had gone up in smaller increments like 0.1 grain instead of 0.4 gr at a time is when you get that one weird hit sometimes 2.
If this were a typical 1000 yard heavygun like a 300 Ackley that plateau would be 2.5 grains wide while the second plateau may only be 2 grains wide.It is in the plateau that you see a very small amount of roll-off.This is what I see when I read Vaughn's thoughts in his book.
Our heavyguns will weigh 75 pounds or more and have a 2 inch barrel on them 32 inches long.The stock is solid aluminum and will weigh 40 pounds empty.The barrel block is integral to the stock so there is no chance of it coming loose.The 8-9 inches of barrel inside of the block are bedded in J-B Weld for a perfect fit.The rest system is as close to a machine rest as the rules will allow and I put 75 pounds of lead shot on it as well.It is a pretty stout set-up.
When I see a shot rolling off we are talking about less than a quarter inch at 400 yards.
Lynn
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