Do You Have Load Data For…..?

Written by Sierra Bullets Ballistic Technician Duane Siercks

We are often asked on the Tech Line if we have data for every conceivable cartridge, bullet, powder combination imaginable. It is not uncommon to hit a snag when trying to find exact component information. We often have to reference other load data sources and try to determine what would be a safe starting place for a given combination. There are always situations where the data may not exist. This requires some extensive background information questions to be asked in order to get enough information to search out an answer. So bear with us as we try to get you the best information we can find. We sometimes have to step away from the desk and phone to grab a resource publication or reference material.

Then there are the easy ones. We have had numerous questions about the new line of Sierra bullets, namely, the Tipped MatchKings® or TMKs. Each of the six bullets that were initially offered were introduced in a weight and caliber where we have an original MatchKing® bullet of the same weight and caliber. We are asked where to find the new load data for the new bullets. This is when we try and help the loader become more familiar with how to really use load data tables. We start off by explaining that we will be using the same load data table as we do for the original MatchKing®. We need to start at the minimum load because there are some differences in the actual profile of the bullets. Then working up in increments that are relative to the case capacity, we then will find that load which performs well in said firearm.

There is another consideration that needs to be addressed here also – that is the Over-All-Length, or OAL. The new TMK® bullets are longer than the original MatchKings®. If loading to fit a magazine, this forces the bullet to actually be seated deeper into the case. This is another important reason to start at the minimum load. Then by working up incrementally, we can keep our attention on pressure indications, just as we should do with all load work.

Load development is not hard, but it’s not fast either. Remember that safety is the utmost concern. Take your time and work deliberately but carefully. One set of components at a time in an uncluttered environment.  Too many times we have heard someone say,”Load data is reduced, so we always start at the max.” That simply is not true and we want to discourage anyone from making that mistake.

We certainly want to help you with any load development questions you may have. If ever in doubt, call us and ask. Remember, there are no stupid questions @ 1-800-223-8799!

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102 Responses to Do You Have Load Data For…..?

  1. Mike says:


    You sell 140gr 6.5mm bullets to a well-known customer that resells them as part of a fire-lapping system. Can you provide me with load data (reduced/starting load) for using this 140gr bullet in the 6.5 Grendel? Thank you kindly.


  2. mario p carrasco says:

    Do you have load data for your 8mm 175gr spt? I was thinking of using IMR 4064. What would be a good starting load and OAL? Im shooting a k98 manufactured in 1944 so .323 diameter is correct.


  3. Thomas M. Sherrin says:

    I have a modern Savage Mod. 14 bolt action in 250 Savage. I was wondering if Sierra has done any Load Data for the newer rifles? All the info that I can find is on the original Mod 99. I also have one of those in the take down style year 1915. I would appreciate it if someone would do some work up on the new model upto and including the 117 grain bullet. Thank you.
    Thomas Sherrin


  4. Ross Pritchard says:

    Please can you give me load data for the 6.5x47lapua using a 140gn matchkings bullet
    Thanks in anticipation.
    Ross Pritchard


  5. Mike says:


    You sell 140gr 6.5mm bullets to a well-known customer that resells them as part of a fire-lapping system. Can you provide me with load data (reduced/starting load) for using this 140gr bullet in the 6.5 Grendel? Thank you kindly.


  6. John Hinz says:

    Does the Sierra Load Manual have data for the Ackley Improved versions of 6.5×55 and 7×57? I’m rechambering a modern CZ in 6.5 and building a new 7×57 and would prefer using established load data to start from.


  7. Mike says:

    Can you provide load data (reduced/starting load) for using the 140gr bullet in 6.5 Grendel? Thank you.


    • Norge says:

      I would seriously rethink your desire to use 140gr bullets in the Grendel. The simple facts are thus; The Grendel was meant to function in AR-15 actions, therefore overall length of the cartridge limits the amount of powder it can hold, and Alexander Arms, after extensive ballistic testing determined that the 120-123 gr bullets offered the best ballistics within the constraints of the cartridges powder capacity. With the short neck of the Grendel, and the need to keep overall length within the maximum 2.255″ oal, a 140gr. projectile must be seated so deep into the case that powder capacity is seriously degraded. Further complicating this issue, one would have to be very careful to NOT compress the powder load with this ‘heavy for cartridge’ bullet, as it would be very easy to exceed the 45,000 psi MAP (max. avg. pressure) of the AR-15 platform, which generally results in serious, if not fatal, consequences. Thus, many manufacturers are most hesitant to even give load data for 140 gr. bullets in the Grendel. Not to mention, that the loss of powder capacity, and the large decrease in velocity for the heavier 140 gr. bullet, will so seriously degrade the performance of the cartridge as to make it quite useless for any practical applications. If you wish to load the 140 gr. bullets anyway, you are, at least, now aware of the potential downfalls you may encounter.


  8. DAVID SMITH says:

    do you have loading data for .40 s&w? thanks


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