Will This Homemade Comparator Work?

CTS

CTS

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Hello all,

I was planning on buying the "Hornady Bullet Comparator" yesterday but after seeing wholesales price of $78 i decided to get it online for $48. Now as i will doing some reloading tonight I had to come up with something else in the mean time. I see that sinclair makes a gauge basically out of a nut and figured this should be easy enough to do. I'm sure my way of drilling a hole that just gets me on the Ogive is not as precise as a machined piece but still has to be better then measuring overall lenghth as a means of finding the correct seating depth.

I re-measure the length when the bullet hits the lands by using a fired case with a bullet put into the action and close the bolt...did this 4 times and got an average of 2.828. I then loaded up my current round and it measured at 2.787 a jump of 0.041, Here i though i was at 0.030 from the lands. I plan on playing around with different jump length from 0.025 - 0.015.

Am i crazy to use this home made tool or does it seem like it should be ok? Going to be on a 7mm Rem Mag

Thanks!
 
scott_r said:
You can buy the inserts for about $5.58 from X Reload. Had you ordered one form there you would have got the comparator and six inserts for $42.

Cheers!!
Click to expand...

That's where i will be ordering it from, just wont be waiting for it to arrive before i reload.
 
That homemade gauge is all you will ever need, and will be every bit as accurate.

But if spending another $70 makes you feel more accurate, then by all means. If you buy two and measure everything twice, maybe you'll become twice as accurate too!
 
max-x said:
That homemade gauge is all you will ever need, and will be every bit as accurate.

But if spending another $70 makes you feel more accurate, then by all means. If you buy two and measure everything twice, maybe you'll become twice as accurate too!
Click to expand...

Well it works, but it takes a bit of playing with to get it in the same repeatable spot, thanks for the remaining useless portion of your post. :jerkit:


thump_rrr said:
The ogive diameter for 7mm is 0.284"
If your hole is accurate then your base to ogive length will be accurate.
Click to expand...

Thanks for the actual measurement, just went and checked mine and it is .260" Can probably modify it a bit more.
 
You homemade hex nut will work in a snap and if similar to the sinclaire's hex nut comparator.

Ensure your bore diameter match the diameter of your comparator. If it's tighter that or larger you're seating depth will be slightly off.

 
Just trying to make a point. You are on the way to reloading enlightenment with your current path and creativity.

Learn how to accurately use that tool you made, spend the 70 bucks on consumables, and you'll come out ahead. Much of the reloading 'equiptment' game is identical to the fishing lure industry. Twenty rows of glitz at Bass Pro doesn't put fish in the boat when you bob around in 10' of water and the fish are at 15'. Similarly, you can spend 100$ on ogive comparison devices and still have vertical dispersion issues because it isn't really the jump that matters. It's just the dimension that is relatively easy to measure. If one plans to use a Hornady comparitor with Hornady bullets, well, that's a misguided exercise of the greatest folly.

You're on the right track. Spend wisely.
 
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