please help me

[quickdeath]

hi guys,,,good morning in the nor east,,,now i am lost here,,,got up at 4:30 this morning,i know kinda early for a sunday,and was looking at some past threads in hunting,brush guns,and drmike said he was getting 1/4 inch groups from a 7mm wsm,,,now is that possible,,,my groups are measured center to center and if they are close out to out,,,now how can a 7mm bullet, measuring .284,bigger than 1/4 inch get 1/4 inch groups,,,like shooting a .500 and getting 3/8 inch groups,,,please help me,,,i don't understand...thanks :? :? :?

 

[6ppcar]

Measure outside to outside and subtract bullet dia.

 

[Charlie-NY]

All groups are measured center-to-center. This way there is no advantage/disadvantage to larger or smaller diameter bullets.

A .224 diameter bullet hole group can be fairly measured against a .308 diameter bullet hole group.

For informal measuring it is easy to just put a set of calipers across the centers of the two farthest bullet holes in the group.

There are more exacting methods used for "official" measurements.

 

[Ol` Joe]

Measure outside to outside and subtract bullet dia.

Or, if your math isn`t up to it, measure from the inside of hole #1 to the outside of hole #2 (the 2 farthest apart)....No subtraction needed :?

Both methods will give you a "center to center" measurment... :wink:

 

[Big Squeeze]

There are different methods for calculating a group size......My preference is, I measure the distance with my digital caliper from outside hole to outside hole at the widest point. So if my group size is say an inch and a half, the holes are 1 1/2" at their widest points.

 

[Charlie-NY]

There are different methods for calculating a group size......My preference is, I measure the distance with my digital caliper from outside hole to outside hole at the widest point. So if my group size is say an inch and a half, the holes are 1 1/2" at their widest points.

This method would not reflect group size. You would have to subtract the actual bullet diameter from the 1 1/2" to get group size.

If two .308 bullets were shot EXACTLY through the same hole, the group size would be 0, not .308. This is why you hear shooters refer to groups in the 1's or 2's which means groups of .10" or 2.0". Obviously this is smaller than the bullet diameter.

 

[Big Squeeze]

There are different methods for calculating a group size......My preference is, I measure the distance with my digital caliper from outside hole to outside hole at the widest point. So if my group size is say an inch and a half, the holes are 1 1/2" at their widest points.

This method would not reflect group size. You would have to subtract the actual bullet diameter from the 1 1/2" to get group size.

If two .308 bullets were shot EXACTLY through the same hole, the group size would be 0, not .308. This is why you hear shooters refer to groups in the 1's or 2's which means groups of .10" or 2.0". Obviously this is smaller than the bullet diameter.

.............That way may be the official way, but the other I mentioned, is my method and preference. I like to measure my groups WITHIN a certain diameter or circle.

 

[old #7]

There is no reason not to smile when you can place a quarter over a five shot group shot at 100yds.
When they're all touching it's time for a thank you dance to rifle gods.

 

[russ808]

+1 old #7

 

[FOTIS]

As to group size.....

I have a 25-06 Savage Tactical. With the 100 grain Ballistic Tips and RL 25 it yields 3400 fps and the best group so far is .0055" at 100 yards!.

 

[DrMike]

All right, POP! That is worth bragging about. I assume that this rifle will never leave your safe for someone else's safe in your lifetime.

 

[FOTIS]

Honestly......once I played with seating depth I saw a huge difference. Once I found the sweet spot it has never done over .2" at 100 yds with the best being .055" ................................................

 

[DrMike]

POP, I'm envious. My personal best is 0.10 inch on a 22-250 load. On many of the new rifles for which I work up loads, 0.25" is common. These rifles will have just been broken in. With a few more rounds, they will only produce tighter groups. On the whole, these are well-built rifles that are a joy to shoot and easy to load for.

Adjusting seating depth with the Winchester magazines works wonders for rifles that otherwise are so-so for rounds. On my 7mm WSM, the first twelve loads were a bust, but adjusting seating depth on a load using AccuBonds so that they were 0.020" off the lands was the sweet spot that yields consistent 0.25" groups. Undoubtedly, I could achieve tighter groups, but this is a hunting rifle and I don't want to risk a jam or unseating a bullet when in the field.

When I was writing this reply, a strange thing happened and it was posted to a new thread. That should certainly confuse the issue.

 

[FOTIS]

keep an eye out......................I maybe selling this 25-06 soon for someting on the other side of the spectrum............................

Never thought I would do this but.............. :twisted:

 

[DrMike]

I'm sure homeland security would not like me buying a rifle to bring back to Canada. Of course, my daughter is moving to Laramie next month and...

I'll keep a watch out. That'd make a fine antelope rifle.

 

[FOTIS]

let me know... :lol: