New brass vs reloaded cases….. insufficient prep?
- Thread starter Andy seatrout
- Start date
Given the current costs of components, I would suggest that only spendthrifts load develop without a chronograph. SD is a useful measure of the quality of your reloading processes. I'm currently using one of these -
SMT Solo - Crispin Engineering
Silver Mountain Targets Solo. Available in the UK for £849. A fourth generation personal e-target system that is portable and affordable. It can be used up to 1000 yards away and gives you immediate feedback on the screen of (almost) any device that supports WiFi and a web browser. A range of...
crispinengineering.co.uk
JCS
Utectok
Well-Known Member
All true but given the scarcity of bullets at the moment it’s a bit scary starting on full blown load development. Whilst it can go sweetly last tricky one I did took 3 powders and 300 bullets….. I can’t by the bullets for love not money now…Given the current costs of components, I would suggest that only spendthrifts load develop without a chronograph. SD is a useful measure of the quality of your reloading processes. I'm currently using one of these -
RegardsSMT Solo - Crispin Engineering
Silver Mountain Targets Solo. Available in the UK for £849. A fourth generation personal e-target system that is portable and affordable. It can be used up to 1000 yards away and gives you immediate feedback on the screen of (almost) any device that supports WiFi and a web browser. A range of...
JCS
Andy seatrout
Well-Known Member
Ah ok, I thought the ladder was looking at drop on a target, something that’s tricky to determine on a short range…. On your other point, I’ll see how the chrono performs today before I eBay it or outlay on another…. I liked the associated app with the Caldwell G3 seemed a neat solution
Utectok
Well-Known Member
Also that system looks fantastic btwGiven the current costs of components, I would suggest that only spendthrifts load develop without a chronograph. SD is a useful measure of the quality of your reloading processes. I'm currently using one of these -
RegardsSMT Solo - Crispin Engineering
Silver Mountain Targets Solo. Available in the UK for £849. A fourth generation personal e-target system that is portable and affordable. It can be used up to 1000 yards away and gives you immediate feedback on the screen of (almost) any device that supports WiFi and a web browser. A range of...
JCS
Utectok
Well-Known Member
I’d forget optical chronos personally … can be random number generators
Stop the bus !
Looking at your process it seems pretty solid to me. You don’t need to be super fancy to get good sd’s. Yours is plenty good enough.
An sd of 13 is a decent target. 20 is 50% worse. 36 is 3x
However I suspect this a classic case of trying to fix something that is not broken. Your data is coming from an optical chronograph. So your mv readings are affected by a passing cloud etc. They are notorious for giving unreliable readings. You are wasting your time and components. I have got this T shirt.
Either borrow/buy a magnetospeed and get a much better read or ignore mvs. Personally I think we all need one but thats another rant.
Just so we are in the same page as to what are the variables and the metrics
ES/SD is an indication of combustion efficiency. This is a requirement for a med/long range load
Group size at 100 is a function of seating depth
If you have both and it will not group at range that is an indicator of a poor bullet
Looking at your process it seems pretty solid to me. You don’t need to be super fancy to get good sd’s. Yours is plenty good enough.
An sd of 13 is a decent target. 20 is 50% worse. 36 is 3x
However I suspect this a classic case of trying to fix something that is not broken. Your data is coming from an optical chronograph. So your mv readings are affected by a passing cloud etc. They are notorious for giving unreliable readings. You are wasting your time and components. I have got this T shirt.
Either borrow/buy a magnetospeed and get a much better read or ignore mvs. Personally I think we all need one but thats another rant.
Just so we are in the same page as to what are the variables and the metrics
ES/SD is an indication of combustion efficiency. This is a requirement for a med/long range load
Group size at 100 is a function of seating depth
If you have both and it will not group at range that is an indicator of a poor bullet
£799 buys a a lot of components.
????????????
Andy seatrout
Well-Known Member
Rain stopped play to day entirely….. went darker and darker didn’t get any sensible readings….. might be spending more money….
Agree with this.
Cleaning etc won't cause what you are seeing but a change in neck consistency will, that includes tension and trim but I doubt trim length is a factor in this cal at this number of firings.
Utectok
Well-Known Member
Honestly I think a lot of hunters just need a group that shoots out to 250-300m so really low sd and ES are not really an issue. If you can match most factory loads with an sd 15-20 and Es of 30-50 you will actually kill alot of deer at normal ranges. Like I say get a load that shoots well at 100 then drop test it at 300m and that’s your dope sorted. No chronograph needed..
If you want to go down the sd rabbit hole……
And I find it satisfying developing a load with sd in single didgets and es in the 20s but it doesn’t kill any more deer 99% of which I shoot under 300m anyway!
If you want to go down the sd rabbit hole……
And I find it satisfying developing a load with sd in single didgets and es in the 20s but it doesn’t kill any more deer 99% of which I shoot under 300m anyway!
That’s one approach that works. Either go that way or pay up for a chrony, but don’t base development on an old style optical chrony. If you are like me you end up shooting the damn things anyway
Andy seatrout
Well-Known Member
I would just go based on groups. Velocity is useful to know but the sd and es are not terribly helpful in this context.
P.s. I see some reference to roll crimps above. Personally I wouldn't attempt to roll a bullet that doesn't have a cannelure
Andy seatrout
Well-Known Member
Hi, fortunately the Hornady SST do have one…. I’ve still not got out to test…
Went stalking instead this afternoon ( no score but saw a few with no safe backstop ( as ever !)
Sure, but I found the SSt cannelure wasn't in the right place..
Andy seatrout
Well-Known Member
It worked for me with 2.905’’ COL?Sure, but I found the SSt cannelure wasn't in the right place..
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