sean c Posted October 29, 2008 Report Share Posted October 29, 2008 Hi all I'm developing a load for my .308 and i just wondered how i should measure the groups.I currently measure from edge to edge is this the right way or should i measure center to center. Cheers. Sean. Quote Link to comment Share on other sites More sharing options...
harv Posted October 29, 2008 Report Share Posted October 29, 2008 centre to centre :blink: i used to use my willy but im a terrible shot and anything over nine inches had to be estimated Quote Link to comment Share on other sites More sharing options...
Graham M Posted October 30, 2008 Report Share Posted October 30, 2008 (edited) The correct way to estimate a group is to measure the overall size (edge to edge) and then subtract the size of the bullet. So if you are using a .308 bullet and shoot a group measuring 20mm across, you have shot a 12.077mm group. G.M. Edited October 30, 2008 by Graham M Quote Link to comment Share on other sites More sharing options...
Browning Posted October 30, 2008 Report Share Posted October 30, 2008 I prefer to use the '£1 coin' method. If I can get 3 shots under a £1 coin it's plenty good enough for me. Quote Link to comment Share on other sites More sharing options...
sean c Posted October 30, 2008 Author Report Share Posted October 30, 2008 Thanks for the replys chaps, Ive just measured the group of the load ive settled on and it measures 0.15'' so i think i'll leave it at that. cheers. sean. Quote Link to comment Share on other sites More sharing options...
MC Posted October 30, 2008 Report Share Posted October 30, 2008 Did you really need to measure that group. 0.15" or 3.81mm would have been a clover leaf and I would have been well pleased. Quote Link to comment Share on other sites More sharing options...
sean c Posted October 30, 2008 Author Report Share Posted October 30, 2008 I measured to see if there was a improvement between weighed and un-weighed bullets. It was a clover shape albeit a squashed one and i cant see the difference in sizes, also i think ive become addicted to shrinking groups. Quote Link to comment Share on other sites More sharing options...
Graham M Posted October 31, 2008 Report Share Posted October 31, 2008 I do **** myself when people quote accuracy to 3 decimal places, measured by hand/eye, estimating the centre of the hole on a 3 shot group. The lad asked a question, and I answered with the correct method. It wasn’t said to make me appear to be some sort of anorak, just giving the proper answer to the question asked. Yes I know it isn’t necessary in the sort of shooting we do, but if the lad wants to be able to tell someone else the correct answer then he will know how to. A .308 bullet is 7.823mm which is how I came to the answer and not by some magical measurement This is the last time I'll bother, as it would appear that each time I give a definitive answer, it causes a problem with one member or another. Take care. G.M. Quote Link to comment Share on other sites More sharing options...
MC Posted October 31, 2008 Report Share Posted October 31, 2008 Graham, Don't take it to heart, the world is full of them. I am still wondering how to answer the comment about a 0.30 dia bullet can make a 0.29 dia hole. Round hole and square peg are springing to mind at the moment. Quote Link to comment Share on other sites More sharing options...
Harnser Posted October 31, 2008 Report Share Posted October 31, 2008 sean.c , I assume that you are going to use the .308 for stalking . I f you can consistantly shoot within a two inch square at 100 yards you have more than enough accuracy for shooting deer at all the sporting ranges . Harnser . Quote Link to comment Share on other sites More sharing options...
sean c Posted October 31, 2008 Author Report Share Posted October 31, 2008 Harnser, I use a .243 for stalking the .308 is for target shooting, my t3 shoots under 1'' @ 100 yards with factory so im happy with that. I dont intend on trying to shrink the .243 just the .308 groups which i normally measure to 3 decimal places because i want to go to 1000 yards. Quote Link to comment Share on other sites More sharing options...
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